The Shin Bet security service said the explosives were sent by Hamas for used in a terrorist attack on Israeli targets in the "near future."
The clashes with Israeli troops were part of a wave of protests.
American analyst Daniel Pipes said he hoped the Knesset Israel Victory Caucus would help him convince U.S. policymakers to "let Israel win."
Four of the 10 senators who signed the letter are Jewish.
A Jordanian newspaper published a photo of the guard's embassy ID a week after the guard fatally shot two, including his teen attacker.
Hamas has used a network of tunnels running from Gaza to southern Israel to launch attacks on Israel and to kidnap Israeli soldiers into the coastal strip.
Russia, which backs Syria’s embattled president, Bashar Assad, summoned its envoy, Gary Koren, on Friday less than 24 hours after the Israeli military action on Thursday night.
"Not only will the transfer of the embassy not harm the peace process, but quite the opposite. It will advance it by correcting a historic injustice."
The tunnel,which ended in Israel near the border with Gaza, is believed to have been dug after the 2014 Gaza war.
The strikes were against targets affiliated with Hezbollah, possibly on a weapons shipment to the Shi’ite terrorist group, which is based in Lebanon but is fighting in Syria.